google-cloud-spanner

Google Cloud Platform spanner library.

• About Cloud Spanner
• Spanner API Documentation
• Rust client Documentation

Installation

[dependencies]
google-cloud-spanner = <version>

Quick Start

Create Client and call transaction API same as Google Cloud Go.

 use google_cloud_spanner::client::Client;
 use google_cloud_spanner::mutation::insert;
 use google_cloud_spanner::statement::Statement;
 use google_cloud_spanner::reader::AsyncIterator;
 use google_cloud_spanner::value::CommitTimestamp;
 use google_cloud_spanner::client::RunInTxError;

 #[tokio::main]
 async fn main() -> Result<(), anyhow::Error> {

     const DATABASE: &str = "projects/local-project/instances/test-instance/databases/local-database";

     // Create spanner client
     let mut client = Client::new(DATABASE).await?;

     // Insert
     let mutation = insert("Guild", &["GuildId", "OwnerUserID", "UpdatedAt"], &[&"guildId", &"ownerId", &CommitTimestamp::new()]);
     let commit_timestamp = client.apply(vec![mutation]).await?;

     // Read with query
     let mut stmt = Statement::new("SELECT GuildId FROM Guild WHERE OwnerUserID = @OwnerUserID");
     stmt.add_param("OwnerUserID",&"ownerId");
     let mut tx = client.single().await?;
     let mut iter = tx.query(stmt).await?;
     while let Some(row) = iter.next().await? {
         let guild_id = row.column_by_name::<String>("GuildId");
     }
     Ok(())
 }

Example

Here is the example with using Warp.

• https://github.com/yoshidan/google-cloud-rust-example/tree/main/spanner/rust

Performance

Result of the 24 hours Load Test.

• This Library : Performance report / CPU Usage
• Google Cloud Go : Performance report / CPU Usage

Test condition

• 2.0 vCPU GKE Autopilot Pod
• 1 Node spanner database server
• 100 Users
• Here is the application for Load Test.